Beginner: How to use data from external Database

Hi,

im new to RoR so sorry if the questions sounds stupid to you.

Im trying to build a tool for a browsergame.
The game allows access to its database and the db looks like this:

table villages:
id int(9) unsigned NOT NULL default ‘0’,
x smallint(3) NOT NULL default ‘0’,
y smallint(3) NOT NULL default ‘0’,
tid tinyint(1) unsigned NOT NULL default ‘0’,
vid int(9) unsigned NOT NULL default ‘0’,
village varchar(20) NOT NULL default ‘’,
uid int(9) NOT NULL default ‘0’,
player varchar(20) NOT NULL default ‘’,
aid int(9) unsigned NOT NULL default ‘0’,
alliance varchar(8) NOT NULL default ‘’,
population smallint(5) unsigned NOT NULL default ‘0’,
UNIQUE KEY id (id)

the contents of the db is a map of the game with villages in it
where one player (identified by his uid) may have several villages.

i have a usertable that looks like this:

table players:
id int(9) unsigned NOT NULL default ‘0’,
username varchar(20) NOT NULL default ‘’,
password varchar(20) NOT NULL default ‘’,
uid int(9) NOT NULL default ‘0’,

(where uid is the userid in the game)

i want to build a association betwen one user and his villages:

class Village < ActiveRecord::Base
belongs_to :player,
:foreign_key => ‘uid’ # doesnt seem to work
end

class Player < ActiveRecord::Base
has_many :villages,
:foreign_key => ‘uid’
end

The problem im having is that rails tries to match the villages by
the id of the table players on not the uid and i dont know how to
tell rails to not use the id but uid instead.

Any ideas?